高粱(约翰逊草)根瘤层氨含量高,表明具有硝化抑制潜力

IF 2.3 4区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Eeshita Ghosh, Nithya Rajan, Dinesh Phuyal, Nithya Subramanian, Muthukumar Bagavathiannan
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引用次数: 0

摘要

研究表明,高粱(Sorghum bicolor)等植物的根部渗出物参与了生物硝化抑制(BNI),这种能力可抑制铵向硝酸盐的转化,从而最大限度地减少铵的流失。作为栽培高粱的一种杂草亲缘植物,约翰逊草(Sorghum halepense)也可能具有生物硝化抑制(BNI)潜能,但人们对此知之甚少。在此,我们在得克萨斯州东南部的七个不同地点进行了实地调查,以确定约翰逊草在不同土壤环境中的这一进化特性。结果发现,在可利用的氮(铵+硝酸盐)总量中,约翰逊草根瘤层保留了高浓度(60%)的铵。此外,与耕地相比,路边生境中的鹅掌楸根瘤层对铵的保留程度明显更高(高达 40%)。约翰逊草的高铵盐截留潜能在一定程度上解释了其持久性和优势,尤其是在边缘环境中。 核心观点 氮是植物生长的限制性养分,硝化作用会导致氮的流失。 与耕地生物型相比,路边约翰逊草生物型的铵保留率更高。 约翰逊草的根瘤铵保留率高,至少可以部分解释其入侵性。 可以进一步研究这一特性,并将其融入现代高粱栽培品种中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

High rhizospheric ammonium levels in Sorghum halepense (johnsongrass) suggests nitrification inhibition potential

High rhizospheric ammonium levels in Sorghum halepense (johnsongrass) suggests nitrification inhibition potential

Plants, such as sorghum (Sorghum bicolor), have been shown to secrete root exudates involved in biological nitrification inhibition (BNI), an ability to suppress the conversion of ammonium to nitrate and thereby minimize its loss. Johnsongrass (Sorghum halepense), a weedy relative of cultivated sorghum, may also possess BNI potential, but little is known in this regard. Here, we conducted a field survey at seven different sites in Southeast Texas to determine this evolutionary trait of johnsongrass in different soil environments. It was found that johnsongrass rhizosphere retains high levels (>60%) of ammonium within the total available N (ammonium + nitrate). Furthermore, the degree of ammonium retention by johnsongrass rhizosphere was significantly greater (up to 40%) in the roadside habitat compared to cultivated fields. The high ammonium retention potential by johnsongrass may explain, in part, their persistence and dominance, especially in marginal environments.

Core Ideas

  • Nitrogen is a limiting nutrient for plant growth, and nitrification causes loss of nitrogen.
  • Ammonium retention was higher in roadside johnsongrass biotypes compared to that of cropland biotypes.
  • The high rhizoshpheric ammonium retention by johnsongrass may explain, at least in part, its invasiveness.
  • This trait could be further investigated and integrated into modern sorghum cultivars.
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来源期刊
CiteScore
3.70
自引率
3.80%
发文量
28
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